JP2002333291A - Heat transfer system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat transfer system in which the size of an indoor unit can be reduced, e.g. the indoor unit can be carried in using an elevator. SOLUTION: The heat transfer system comprises a condenser 5 and a plurality of evaporators 9 disposed, respectively, in a plurality of indoor units 7 each installed in the ceiling 10 above a ceiling plate 8 of the same room having a corresponding air outlet 12. A natural circulation cycle is formed by connecting the condenser 5 and the evaporator 9 through a refrigerant liquid pipe and a refrigerant gas pipe 19 and encapsulated with refrigerant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat transfer device of a refrigerant natural circulation type.

[0002]

2. Description of the Related Art Generally, a heat transfer apparatus using a heat pipe system in which a refrigerant is naturally circulated by changing a gas-liquid phase in a cycle is known.

[0003] This type includes one condenser and one evaporator at a lower position than the condenser.
The space between these is connected by a refrigerant liquid pipe in which a liquid-phase refrigerant flows and a refrigerant gas pipe in which a gas-phase refrigerant rises, thereby forming a natural circulation cycle. A refrigerant is sealed in the natural circulation cycle. The evaporator is housed in an indoor unit, and the indoor unit cools the room.

Generally, to cool a room with a large air-conditioning load, a heat transfer device having a large capacity is required, and a condenser or an evaporator (ie, an indoor unit) becomes large.

[0005]

However, when a large indoor unit is installed behind a ceiling in a room of a building, a large space for accommodating the indoor unit is required, and the arrangement of the indoor unit is restricted, or the indoor unit is placed behind the ceiling. There is a problem that it may be difficult to install the device.

In addition, when the large indoor unit is carried into a room of a building, there is a problem that it is difficult to carry the indoor unit by an elevator.

[0007] Therefore, an object of the present invention is to provide a heat transfer device that can reduce the size of an indoor unit and can easily carry the indoor unit into an elevator in order to solve the above-mentioned problems.

[0008]

The invention according to claim 1 comprises a condenser and a plurality of evaporators, and the evaporators are separately installed in a plurality of indoor units. Installed behind the ceiling plate in the same room having a discharge port corresponding to the indoor unit, connected between the condenser and the evaporator with a refrigerant liquid pipe and a refrigerant gas pipe to form a natural circulation cycle, A refrigerant is sealed in the natural circulation cycle.

According to a second aspect of the present invention, in the first aspect, the refrigerant liquid pipe includes a refrigerant liquid main pipe connected to the condenser and a plurality of refrigerant liquids connected to each evaporator. A liquid branch pipe, the refrigerant gas pipe is configured by a refrigerant gas main pipe connected to the condenser, and a plurality of refrigerant gas branch pipes connected to each evaporator; The refrigerant liquid pipe connection point connecting the refrigerant liquid branch pipe and the refrigerant gas pipe connection point connecting the refrigerant gas main pipe and the refrigerant gas branch pipe are located higher than the evaporator. It is.

[0010] The invention described in claim 3 is the invention according to claim 1 or 2.
In the invention described in (1), the plurality of indoor units are installed at substantially the same height behind the ceiling.

The invention described in claim 4 is the first or second invention.
In the invention described in the above, among the plurality of indoor units, the indoor unit installed on the side with the higher thermal load in the same room is at a lower position than the indoor unit installed on the side with the lower thermal load and the condenser It is characterized by being installed close to it.

According to these inventions, since a plurality of indoor units having the evaporator are provided, the indoor units can be reduced in size, and for example, the indoor units can be easily carried in the elevator.

[0013]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a heat transfer device. The heat transfer device 1 includes a refrigerator 3 for cooling water, a refrigerant / water heat exchanger 5 functioning as a condenser, and a plurality of indoor units. Machine 7. The indoor unit 7 contains an evaporator 9, a refrigerant regulating valve 11, and a blower 13 for blowing air into the room. The refrigerant-to-water heat exchanger 5 is installed at a high place such as the roof of a building. The indoor unit 7 is mounted on the refrigerant-to-water heat exchanger 5 so that the suction port of the evaporator 9 is substantially at the same height.
It is installed below the ceiling 10 of the ceiling plate 8 in the lower part of the building. The ceiling plate 8 has a discharge port 12 corresponding to each indoor unit 7.

The refrigerator 3 is, for example, an absorption refrigerator.
The refrigerator 3 and the refrigerant-to-water heat exchanger 5 are connected in a loop by a water pipe 15.

The refrigerant-to-water heat exchanger 5 has a refrigerant liquid pipe 17.
The refrigerant gas pipe 19 connects the indoor unit 7 to form a natural circulation cycle. A refrigerant is sealed inside the natural circulation cycle.

The refrigerant liquid pipe 17 has a refrigerant liquid main pipe 17A.
And a plurality of refrigerant liquid branch pipes 17B connected to the refrigerant liquid main pipe 17A. The refrigerant gas pipe 19
Is composed of a refrigerant gas main pipe 19A and a plurality of refrigerant gas pipes 19B connected to the refrigerant gas main pipe 19A. The refrigerant liquid main pipe 17A and the refrigerant gas main pipe 19A are connected to the refrigerant / water heat exchanger 5, and each refrigerant liquid branch pipe 17B and each refrigerant gas branch pipe 19B are connected to the evaporator 9 of each indoor unit 7. Due to these connection relationships, the evaporators 9 are in parallel with each other. The refrigerant adjustment valve 11 is connected to the refrigerant liquid branch pipe 17B. Also,
A booster pump 21 for forcibly circulating the refrigerant is connected to the refrigerant liquid main pipe 17A.

Here, the refrigerant liquid main pipe 17A and the refrigerant liquid branch pipe 1
7B, refrigerant gas pipe connection point R, and refrigerant gas main pipe 19A
Connecting point S between the refrigerant gas pipe 19B and the refrigerant gas pipe 19B is the evaporator 1
It is located higher than 8.

Next, the operation of the natural circulation type heat transfer device 1 will be described.

When the refrigerator 3 is operated, the refrigerant / water heat exchanger 5
Is supplied with, for example, 5 ° C. cold water. Then, the refrigerant condenses in the refrigerant-to-water heat exchanger 5, becomes a liquid refrigerant having a large specific gravity, and flows through the refrigerant liquid main pipe 17 </ b> A of the refrigerant liquid pipe 17.

The liquid refrigerant reaching each refrigerant liquid pipe connection point R of the refrigerant liquid main pipe 17A flows from a high place to a low place through each refrigerant liquid branch pipe 17B by its own weight, and flows to each indoor unit 7.

The liquid refrigerant whose refrigerant amount has been properly adjusted by the refrigerant regulating valve 11 of the indoor unit 7 flows into the evaporator 9, where the liquid refrigerant evaporates at, for example, an evaporation temperature of 12 ° C. In this process, the liquid refrigerant becomes a gas refrigerant having a very small specific gravity, and this gas refrigerant flows through each refrigerant gas branch pipe 19B from a low place to a high place and passes through each refrigerant gas pipe connection point S because of its light weight. The refrigerant flows into the refrigerant gas main pipe 19A and is returned to the refrigerant-to-water heat exchanger 5. That is, in this system, the refrigerant naturally circulates due to the gas-liquid phase change in the natural circulation cycle.

The indoor air passes through a ventilation port 23 provided in the ceiling plate 8, is sucked into each indoor unit 7, is cooled by the evaporator 9, is blown into the room from the discharge port 12 by the blower 13, The room is cooled.

In such a natural circulation system, the refrigerant in the cycle is naturally circulated according to the difference in specific gravity between the liquid refrigerant and the gas refrigerant. Therefore, a circulating pump or the like is not required. However, the booster pump 21 is used as an example in the case where it is difficult to make a head drop between the refrigerant / water heat exchanger 5 and the evaporator 9 when constructing the natural circulation system.

According to the present embodiment, even when a large refrigerant-to-water heat exchanger 5 is required, a plurality of indoor units 7 are provided for this one refrigerant-to-water heat exchanger 5. From that
The indoor unit 7 can be reduced in size, and can be installed even in a narrow ceiling 10. Furthermore, since the indoor unit 7 is downsized, it is possible to carry it in by an elevator, and it is easy to carry the indoor unit 7 into a room in a building.

Since each indoor unit 7 is installed so that the suction port of the evaporator 9 in the indoor unit 7 is at substantially the same height, the amount of liquid refrigerant flowing into each indoor unit 7 And the heat exchange (cooling) in any of the indoor units 7
Since the capacity is equal, the room can be cooled evenly.

As described above, the present invention has been described based on one embodiment, but the present invention is not limited to this.

In the above-described embodiment, the case where each indoor unit 7 is installed at substantially the same height in the ceiling back 10 has been described. However, although not shown, for example, in FIG. The indoor unit installed on the side of the same room where the heat load is large, the other indoor unit 7 is the indoor unit installed on the side with a small heat load, and the indoor unit installed on the side with a large heat load is If the refrigerant is installed at a position lower than the indoor unit installed on the side where the heat load is smaller and closer to the water-to-water heat exchanger 5 that functions as a condenser, a large amount of liquid refrigerant will be supplied to the indoor unit on the side where the heat load is larger. Flows, and the cooling capacity is increased, resulting in an ideal cooling state.

[0029]

According to the present invention, the indoor unit can be downsized,
For example, it becomes easy to carry in the elevator of the indoor unit.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing one embodiment of a heat transfer device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat transfer apparatus 5 Refrigerant-water heat exchanger (condenser) 7 Indoor unit 8 Ceiling board 9 Evaporator 10 Above ceiling 12 Discharge port 17 Refrigerant liquid pipe 17A Refrigerant liquid main pipe 17B Refrigerant liquid branch pipe 19 Refrigerant gas pipe 19A Refrigerant gas Main pipe 19B Refrigerant gas branch pipe R Refrigerant liquid pipe connection point S Refrigerant gas pipe connection point

Claims (4)

[Claims] 1. A condenser comprising: a condenser; and a plurality of evaporators, the evaporators are separately installed in a plurality of indoor units, and the indoor units have ceilings in the same room having discharge ports corresponding to the respective indoor units. It is installed behind the ceiling of a plate, and a natural circulation cycle is formed by connecting the condenser and the evaporator with a refrigerant liquid pipe and a refrigerant gas pipe, and a refrigerant is sealed in the natural circulation cycle. And heat transfer equipment. 2. The refrigerant liquid pipe includes a refrigerant liquid main pipe connected to the condenser, and a plurality of refrigerant liquid branch pipes connected to each evaporator, and the refrigerant gas pipe includes the condenser gas pipe. A refrigerant gas main pipe connected to the evaporator and a plurality of refrigerant gas branches connected to the evaporators, a refrigerant liquid pipe connection point connecting the refrigerant liquid main pipe and the refrigerant liquid branch pipe, and the refrigerant The heat transfer device according to claim 1, wherein a refrigerant gas pipe connection point connecting a gas main pipe and the refrigerant gas branch pipe is located higher than the evaporator. 3. The indoor unit according to claim 1, wherein the plurality of indoor units are installed at substantially the same height behind the ceiling.
A heat transfer device according to claim 1. 4. Among the plurality of indoor units, the indoor unit installed on the side of the same room where the heat load is higher is located lower than the indoor unit installed on the side of the lower heat load and closer to the condenser. 3. The device according to claim 1, wherein
A heat transfer device according to claim 1.